KR20180121762A

KR20180121762A - 3d printer

Info

Publication number: KR20180121762A
Application number: KR1020170055837A
Authority: KR
Inventors: 최우형
Original assignee: 주식회사 엔터봇; (재)한국건설생활환경시험연구원
Priority date: 2017-04-30
Filing date: 2017-04-30
Publication date: 2018-11-08

Abstract

A three-dimensional printer according to the present invention includes a discharger for moving X-axis, Y-axis, and Z-axis and melting and discharging a printing material, a bed on which the designed sculpture is formed, a camera for picking up the image toward the bed, And a second input port through which the second printing material is fed, wherein the first printing material and the second printing material are supplied to the discharging unit, wherein the discharging unit includes a first charging port for charging the first printing material and a second charging port for charging the second printing material, The second printing material is melted and ejected to the nozzle. The controller senses the ejection line according to the pre-printing performed before the present printing, and performs the printing if it detects that the ejected ejection line has been formed in a predetermined pattern And controls the amount of the second printing material to be supplied if the pattern is not a predetermined pattern.

Description

[0002] A three-dimensional printer capable of adjusting the discharge amount

The present invention relates to a three-dimensional printer, and more particularly, to a three-dimensional printer capable of controlling the characteristics of a molten material discharged from a nozzle by controlling an input amount of a printing material.

An extruder of a three-dimensional printer is a device for discharging a printing material. A rigid solid material may be used as the material to be fed into the extruder, but a liquid material or a powder material may be injected. These materials are melted in an extruder and finally discharged to a nozzle, which is discharged in a molten state by heating.

The sculptures designed by the computer system can further perform a post-treatment process for visual effects, but the physical properties of the discharge may be controlled by adding additives to the extruder. However, when the additive is added to the discharged material, the melting state may be changed depending on the characteristics of the additive, and the melted state may become a diluted state that is not suitable for lamination.

In the 3D printer normal output verification device of Patent Publication No. 10-2017-0010140 A method of printing a low-melting-point material of a 3D printer disclosed in Japanese Patent Application Laid-Open No. 10-2016-0147633 Patent Document 1: JP-A-10-2014-0195073: Photocurable 3D printer and method of measuring light quantity deviation and correction method thereof A 3D printer extruder including an integral nozzle of Patent Document 10-2017-0010624

It is an object of the present invention to provide a three-dimensional printer which can be printed in a state that a molding material stacked on a bed has appropriate physical properties even when different printing materials are used.

It is also an object of the present invention to provide a three-dimensional printer which can prevent a defective stacking at the time of printing by performing a pre-printing process even when an additive is added to an ejector.

The problems to be solved by the present invention are not limited to the above-mentioned problems. Other technical subjects not mentioned will be apparent to those skilled in the art from the following description.

Here, the first printing material according to the present invention is a solid, and the second printing material is composed of a liquid.

Meanwhile, the discharge line according to the present invention comprises a pair of first discharge line and second discharge line having a predetermined separation distance.

The predetermined pattern refers to a state in which a part of the first discharge line and a part of the second discharge line are merged with each other.

The bed according to the present invention has a printing area AA and a pre-printing area CC spaced apart from the printing area by a predetermined distance. The printing area is a region where the printing is performed, and the pre-printing area is pre- Area.

According to the present invention, the merge state of a pair of ejection lines formed by pre-printing can be confirmed and the present printing can be performed to prevent the printing failure in advance.

1 shows a three-dimensional printer according to the present invention.
Figure 2 shows a hypothetical area set on a bed according to the invention.
3 shows a discharge line formed in the pre-printing according to the present invention.
Fig. 4 shows a section of SS and a section of MM of Fig. 3 (b).
FIG. 5 illustrates pre-printing using a three-dimensional printer according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, elements shown in the drawings may be exaggerated, omitted, or schematically represented.

1 shows a three-dimensional printer according to the present invention.

The three-dimensional printer according to the present invention includes a discharger 100 for moving X-axis, Y-axis, and Z-axis and melting and discharging a printing material, a bed 200 on which a designed molding is formed, And a controller 400 for controlling the input amount of the printing material based on the image sensing information of the camera.

A first inlet 110 and a second inlet 120 for introducing the first printing material and the second printing material are formed on the upper portion of the discharger 100. A nozzle for discharging the molten material is disposed at the lower end of the discharger 100 nozzle. The first printing material according to the present invention is a solid material in the form of pellets and the second printing material is a liquid phase additive added to the solid material. The pellet may be ABS, PLA or the like, and the additive may be a color material, an emulsifying agent, a hardening material, or the like.

In the discharger, the first printing material and the second printing material are mixed and melted. The viscosity of the melt discharged from the nozzle may vary according to the mixing ratio of the first printing material and the second printing material. According to the present invention, the mixing amount of the second printing material for the first printing material is controlled to control the viscosity of the melt discharged from the nozzle.

A nozzle is provided at a lower portion of the discharger, and the printing material is discharged in a molten state in the nozzle. In order to melt the printing material, a heater may be further provided on the body of the discharger.

As an embodiment, a cooler may be further provided on the top of the heater to prevent the pellet and the additive from being pre-melted when the printing material, that is, the pellets and the additive, is introduced.

In the bed 200, a molding designed from a molten material discharged from the discharger is shaped. A heater may further be provided in the lower portion of the bed for curing the molten material to be discharged.

Figure 2 shows a hypothetical area set on a bed according to the invention.

The bed according to the present invention has a rectangular shape with a printing area AA at the center, a forbidden area DD at the edge, a spacing BB between the printing area and the forbidden area, and a pre- CC) is set. The pre-printing area is adjacent to the forbidden area, and the spaced area is adjacent to the printing area.

The printing area AA is the area where the printing is performed, and the pre-printing area CC is the area where the pre-printing is performed. The pre-printing is performed before the present printing.

The camera 300 is installed above the pre-printing area CC of the bed. The camera images the discharge line of the molten material discharged in the pre-printing area of the bed.

The controller (400) adjusts the amount of the second printing material to be supplied to the second input port (120) based on the sensing information of the discharge line output from the camera.

Hereinafter, printing using the three-dimensional printer according to the present invention will be described.

The three-dimensional printer according to the present invention is pre-printed before the present printing. When the molten material discharged from the nozzle maintains a constant viscosity, normal lamination can be performed. This viscosity is determined by the melting state of the material, the printing temperature, and the like. The melt initially discharged is difficult to maintain the required level of viscosity. Thus, it is necessary to confirm whether the lamination is normally performed. In particular, in the case of a method in which a printing material and an additive are mixed and discharged into a nozzle in the discharger, the printing should be performed after a proper mixing state is established. In the present invention, a pre-printing step is performed to confirm whether the viscosity of the molten material discharged at the initial stage reaches a certain level of viscosity.

The pre-printing is performed by forming at least one pair of ejection lines having different distances on the bed. The pair of ejection lines are printed so as to have a preset separation distance.

FIG. 5 illustrates pre-printing using a three-dimensional printer according to the present invention.

The pre-printing according to the present invention is performed according to the control of the controller. The pre-printing according to the present invention includes a step (S100) of forming a pair of discharge lines having a predetermined separation distance, a step (S200) of picking up the pair of discharge lines and detecting a preset pattern, And performing the present printing process (S300) when the ejection lines of the pair are a predetermined pattern.

In the step of forming the pair of discharge lines, a pair of discharge lines having a predetermined predetermined distance are formed. Here, the preset predetermined distance refers to the printing result of the melt having a viscosity enough to perform the printing. These results have height and width suitable for printing.

FIG. 3 shows a discharge line formed in the pre-printing according to the present invention. Referring to FIG. 3, the discharge line includes a first discharge line (left discharge line) and a second discharge line Right discharge line).

The spacing distance is set to a distance at which a part of the discharge lines discharged by an appropriate mixing ratio of the first printing material and the second printing material can be merged. Such a separation distance may vary depending on the size of the nozzle and the discharge speed.

3 (b) shows that the first discharge line and the second discharge line form a discharge line suitable for the present printing, and a part of the first discharge line and the second discharge line are in a merged state. This merge state means that the first printing material and the second printing material are put into the discharger at a proper ratio, and that they have a viscosity suitable for the printing. On the other hand, the partially merged state may be set to 1/3 to 2/3 of the discharge length of the first and second discharge lines.

In contrast, when the second printing material is relatively small and the viscosity is lowered, the first and second discharge lines are spaced apart from each other as shown in FIG. 3 (a), and the second printing material is relatively When a large amount of the solvent is injected to increase the viscosity, the first discharge line and the second discharge line are completely merged with each other as shown in FIG. 3 (c).

Fig. 4 shows a cross section of the SS and a cross section of the MM in Fig. 3 (b). Fig. 4 (a) shows the cross section of the SS, And a pair of discharge lines are partially merged. It is determined that the ink has a sufficient viscosity to carry out the printing when a part of the discharge lines is merged.

A step S200 of sensing the pair of discharge lines and detecting whether or not the pattern is a preset pattern detects whether a pair of discharge lines formed on the bed is a predetermined pattern. The predetermined pattern detects whether a part of the first discharge line and the second discharge line is in a merged state.

If the state in which the first discharge line and the second discharge line are separated from each other is sensed, the charging ratio of the second printing material to the first material is increased, and when the first discharge line and the second discharge line are completely merged Thereby reducing the input ratio of the second printing material to the first printing material. On the other hand, the image pickup of the first discharge line and the second discharge line is preferably performed after about 3 to 5 seconds after the discharge line is formed by the pre-printing. It is preferable that the imaging time is set to a time for confirming whether the merge is formed or not.

The process of controlling the input ratio of the second printing material is repeated until a part of the first ejection line and the second ejection line are merged. When a part of the first discharge line and the second discharge line are repeatedly adjusted, the present printing process is performed (S300).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the present invention is not limited to the disclosed exemplary embodiments, but various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

100: Discharger
110: 1st inlet
120: 2nd inlet
200: Bed
300: camera
400: controller

Claims

(100) for moving the X-axis, Y-axis and Z-axis and melting and discharging the printing material, a bed (200) on which the designed sculpture is formed, a camera (300) And a controller (400) for adjusting an amount of the printing material to be charged based on the sensing information of the printing material,
Wherein the discharger is provided with a first charging port into which the first printing material is charged and a second charging port through which the second printing material is charged,
Wherein the first printing material and the second printing material are melted and discharged to a nozzle,
The controller captures an ejection line according to pre-printing performed prior to the present printing, and controls to perform the printing if it detects that the ejected ejection line has been formed in a preset pattern, and if not, And controls the amount of material to be supplied to the three-dimensional printer.

The method according to claim 1,
Wherein the discharge line is a first discharge line and a second discharge line which are separated from each other,
Wherein the predetermined pattern is a state in which a part of the first discharge line and a part of the second discharge line are merged with each other.

The method according to claim 1,
The bed has a printing area AA and a pre-printing area CC spaced a predetermined distance from the printing area. The printing area is a region where printing is performed, and the pre-printing area is a region where pre- Dimensional printer.